Hot tinning lead gun



June 16, 1959 c. T. MANGRUM ET AL 2,890,834

7 HOT TINNING LEAD GUN Filed April 3, 1958 3 -SheetsSheet lwllnlallllllllll GYTIl/an rum I Y aazvmz INV T0115 I 1 5- BY ATTORNEYSJune 16, 1959 c. T. MANGRUM ET AL 2,890,834

' HOT' TINNING LEAD GUN Filed April 3, 1958 3 Sheets-Sheet 2 a 4-- IWA'7 CTTMa/n rum 6Y0, Ever-e22 IN NTORS 1 I I BY- 1,

ATTORNEYS.

June 16, 1959 c. MANGRUM ET 2,390,334

HOT TINNING LEAD GUN Filed April 5. 195a 3 Sheets-Sheet s i 5 I" IIIIIIIIII I14 I a g I l l I V I I l 1 I ,1

, 0.77m" rum I BY ATTORNEYS 2,890,834 Patented June 16, 1959 ice HOTTINNING LEAD GUN Clifford T. Mangrum and Cleaford 0. Everett, Stockton,Calif.

Application April 3, 1958, Serial No. 726,077

1 Claim. (Cl. 239-85) This invention relates toan apparatus known as ahot lead gun to be used in the hand of an operator, the apparatus ortool being designed for the application of hot lead in spray form, andparticularly constructed for use in repairing motor vehicle bodies.

An important object of the invention is to provide an apparatus which isso constructed that the operator using the gun will have completecontrol over the distribution of the hot lead sprayed, and at the sametime, an apparatus which will reduce the manpower hours or labor time toa minimum.

Another important object of the invention is to provide a self-containedtool of this character which includes a heating pot together with meansfor supplying air under pressure at the point of discharge of the heatedliquified lead, resulting in the conversion of the hot lead into a finespray for accomplishing the desired purpose, thereby eliminating the useof cold tinning compounds, with time-saving results.

Still another object of the invention is to provide an apparatus of thischaracter which will eliminate lead dust during the application of thelead to a minimum, to the end that the apparatus may be operated withsafety without the use of a face mask.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts, hereinafter more fully describedand pointed out in the claim, it being understood that changes may bemade in the construction and arrangement of parts without departing fromthe spirit of the invention as claimed.

Referring to the drawings:

Figure l is a side elevational view of an apparatus constructed inaccordance with the invention.

Fig. 2 is a longitudinal sectional view through the apparatus.

Fig. 3 is a transverse sectional view taken on line 3-3 of Fig. 2.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 2.

Fig. 5 is a sectional View taken on line 55 of Fig. 2.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 2.

Fig. 7 is a sectional view taken on line 7--7 of Fig. 2.

Fig. 8 is a sectional view taken on line 8-8 of Fig. 2.

Fig. 9 is a sectional view taken on line 99 of Fig. 2.

Fig. 10 is a transverse sectional view taken on line 10-10 of Fig. 11.

Fig. 11 is a sectional view taken on line 11--11 of Fig. 10.

Fig. 12 is a fragmental elevational view illustrating the cam operatingvalve rod controlling the flow of air into the lead pot of the device.

Referring to the drawings in detail, the apparatus includes a bodyportion indicated generally by the reference character 5 and, as shown,is elongated horizontally and provided with an open bottom and openends.

Extending into the body portion 5, is a bar 6 which 2 has its side edgescontacting the inner surfaces of the body 5,. where the bar is securedin position by means of bolts 7 and 8.

As better shown by Figure 2 of the drawings, the forward end of the bar6 extends beyond the front end of the body 5, where it provides asupport for the burner chamber 9 which is held in place on the bar 6 bymeans of a bolt 10 which is shown as extending through an opening in thebar 6 with its threaded end secured within a threadedbore formed in thebottom of the burner chamber 9. 1

The burner chamber 9 provides a support for the lead pot 11, the bottomof which rests directly on the burner chamber 9, as clearly shown byFigure 2 of the drawings, so that the heat from the burner, chamber willmaintain the lead contained in the lead pot, in liquid state forconversion into a fine spray for distribution on the surface to berepaired.

A lead outlet nozzle 12 is provided in the base of the lead pot 11, thenozzle being provided with a valve seat on which the valve 13 engages tocontrol the flow of molten lead from the lead pot.

The valve 13 is formed on the inner end of the valve rod 14, whichextends through a leak-proof valve rod guide 15 which is located in thewall of the lead pot 11.

The rod 14 is substantially long and extends through an opening 14 inone end ofthe bell crank lever 16 where it is held in place by nuts 15'threaded on the end; of rod 14. The bell crank lever 16 has pivotalconnection with the arms 17 that are secured to the body 5 by means ofbolt 18, the arms 17 supporting the bell cranklever 16 in a positionbeyond the rear end of the body 5.

The other end of the bell crank lever indicated at 19 is offset as shownby Fig. 3 of the drawings, and is provided with a downwardly extendedear 20 that has pivotal connection with the upper end of the valve rod24 that operates adjacent to a valve housing 22.

The valve rod 24 is provided with a cam member 49 that moves over avalve rod 21 which extends into said valve housing 22 and rests againstball valve 46 normally held seated by the spring 50, the rod 21unseating said ball valve when moved to the limit of its inward movementreleasing air into pipe 30 and nozzle 32 to be hereinafter more fullydescribed.

A manually controlled valve 51 regulates the flow of air into valve 22from the air line 25. The operating rod 24 extends along the outersurface of the air line 25 that supports the valve housing 22 at itsupper end, as shown by Figure 2.

The operating rod 24 has pivotal connection with one end of the bellcrank lever 26, the bell crank lever being pivotally supported on thehollow handle 27 that rests against the lower edges of the side walls ofthe body 5, as shown by Figure 2 of the drawings.

One end of the bell crank lever 26 provides the trigger for the gun, andis indicated by the reference character 28, the trigger 28 being soarranged that when the handle 27 is gripped, the fingers of the operatormay grip the trigger 28 to move the same in unseating the air valve 46and lead control valve 13, simultaneously.

A pipe indicated by the reference character 29 connects with the airline 25, the pipe 29 also being in communication with a suitable sourceof compressed air supply, not shown.

Communicating with the valve housing 22, is a pipe 30 that extends intothe valve housing and has its discharge end 31 formed into a nozzle 32which rests directly on the floor of the lead pot 11, with the nozzledisposed so that it will discharge air under pressure upwardly andforwardly to cause molten lead to be discharged through the outletnozzle 12 in a fine spray, according to the adjustment" of" the valve"13;

The pipe 33 is the fuel line -for the gun, and connects with a suitablesource of fuel supply, not shown. The

. of the-pipe 35 extending through an opening in the wall" of" theburner chamber" 9,- where it is disposed directly under the bottom ofthe lead put 11, to supply heat to the lead pot" to maintainthe lead ina= molten condition.

The burner'charnber 9=is provided with the usual. openings38 disposedatthe base thereof toadmit oxygen to the burner 37.

A-l'so connectedi with* the pipe.- 34 is apipe 39 that extendslaterallyfrom the pipe 34- and provides a support for the pipes 40'on which theflame thrower burners 41 are-supported, the flame throwerburners being so located that they-wi1l preheat the metal undertreatment, for in stanfi t-inning, while the nozzle .12 sprays the'molten lead on the hot surface, under treatment.

The pipe 39 is supported by means of the bracket 42 that is secured tothelower surface of the. bar 6, the bracket 42 being inthe form ofametal band or loop on which the pipe 39 rests.

The pipes 40 whichextend laterallyfrom one end of the pipe 39, aresupportecL by the bracket 43; which is also in the form-of ab'andsecured to the lower surface of-' 'the bar 6 and on whichthe pipes 40rest.

Thereference character 44 indicates: a shield plate which is so arrangedthat itw-ill shieldthe operators hand; which is grippingthe-handle 27and operating the trigger 28, againstthe heat generated by the burnersof the apparatus.

A guard 45' is" secured to the outer surface of th burner chamber 9 andis spaced a substantial distance from the forward wall thereoftoregulate the draft of air entering the burner chamber 9;

Valve 52 controls the passage of fuel to the burner 37, while valve 53controls the flow of fuel through pipe 39-to-theburners4-1= It might befurther stated that the lead pot 11 is provided with a conventionalcover 46' to prevent accidental displacement of the molten lead from thepot, during the operation of the mechanism.

From the foregoing it will be seen that due to the construction shownand described; I have provided an ap paratus forheatingrandwmaintaining-ileadused in repairing motor vehicle bodies, ina molten state, together with manually controlled valves for controllingthe discharge of the molten lead through the discharge nozzle toaccurately position the molten: lead in a spray. form.

The tool is self-contained and exceptionally convenient for operation.

Having thus described the invention, what is claimed 1s:

A self contained apparatus for heat tinning a metal surface andapplyingrlead-in a fine spray to the heat tinned surface, comprising anelongated body, a lead pot having-a discharge nozzle mounted on theforward end of said" body, a burner chamber directlyunder said lead pot,a burnerextendinginto said burner chamber heatihg'lead contained in saidlead 'pot-g an airnozzle extending into said lead pot adjacent to saiddischarge. nozzzlefor'directingair underpressureto'said discharge nozzleof said lead pot converting molten lead issuing from said dischargenozzle. into a fine spray, a handlesecured to thebottom of said body foreffecting mani'pulatio'n of said apparatus, and mechanism including atrigger mounted on said handle, gripped by the operator for controllingthe: discharge of" molten'lea'd from said lead pot'and simultaneouslydirecting air under pressure into: the flow ofi molten lead convertingthe moltenlead into a'fine' spray;

References Cited" in the file ofthis patent UNITED STATES PATENTS TaylorNov., 14, 193.31 Miller. Feb. 13, 19.51.

